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I was just wondering as it's something I often find myself doing, but is there a automated way to scale selected UVs to fit to the edges of the image boundary in the UV editor?

Currently I have a process which isn't too time consuming, but nonetheless a little bit more so than hitting a button. These images show my process and what I am trying to achieve.

1. Calculate scale value 2. Apply scale and realign

Note: that I scaled everything by the same value, but if I wanted to fit the image square, I would have to do this process once for width and again for height.

Is there a built-in function to do this?

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3 Answers 3

Reset to default
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Grab to corner + Scale (not preserving proprtions)

With the Rotation/Scaling Pivot set to 2D Cursor and the cursor in the origin (0,0), activate the Constraint to Image Bounds option, grab the island in the corner and then scale:

enter image description here

Pack island+Scale (preserving proportions)

As stated by the Blender Reference Manual:

The Pack Islands tool, shortcut Ctrl+P, will uniformly scale, then individually transform each Island so that they fill up the UV space as much as possible.

enter image description here

You can select multiple UV island to scale them while maintaining their relative proportions, or even just one as in the example to quickly scale every possible previusly unwrapped island to the bounds being sure it will not be stretched.

Notice that the box in the toolshelf is unchecked to prevent island's rotation.

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  • $\begingroup$ Awesome! I'd seen the projection using bounds in other answers on BSE, but I didn't know about constrain to image bounds. I didn't realise pack islands would work individually either. My way seems really stupid now :) Thanks! $\endgroup$
    – MrFlamey
    Oct 7, 2015 at 0:54
  • $\begingroup$ Option 1 still works in Blender 2.91.0 but the UI looks different, in "UV Editing" mode: 1. The "Rotation/Scaling Pivot" option is hidden behind a symbol that's directly below the menu bar with the "UV Editing" tab and that looks like a crosshair (fat dot in the middle with an outer ring and 4 lines touching it). 2. "Constrain to Image Bounds" can be found in the "UV" menu (another bar down). Alternative: With the UVs selected, hold down shift after pressing "g" ("grab") or "s" ("scale") while moving the mouse to snap to the grid of the image. $\endgroup$
    – Neph
    Dec 6, 2021 at 13:06
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When unwrapping you can use Project from view (Bounds) to fit the UVs using the full image on the UV editor.

enter image description here

Or you can edit the UVs using the Constrain to image bounds option:

enter image description here

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  • $\begingroup$ +1, I had to unwrap something from top view but it was a pain to scale it to match the bounds, glad I found this before I inflicted too much brain damage to myself $\endgroup$
    – Nicolas Martel
    Oct 18, 2016 at 3:17
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U > Project from view (Bounds)

In the Tool Shelf (N) or F6, check Scale to Bounds

In Blender 3.2, adjust the unwrap settings in the Adjust Last Operation (F9).

enter image description here

enter image description here

For further information see the Blender Manual

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  • $\begingroup$ Thanks, but this is not quite what I'm looking for, since my object is complex and I arranged the UVs in a grid using the follow quads option. $\endgroup$
    – MrFlamey
    Oct 7, 2015 at 0:55

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